Time-limited interventions may attenuate stigma and negative beliefs about borderline personality disorder (BPD) among mental health clinicians. This study examined whether a 1-day training in good psychiatric management (GPM) changed clinician attitudes and beliefs and whether those changes persisted over time. Fifty-two mental health clinicians attended a 1-day GPM training and completed a 13-item assessment of attitudes about BPD before and after the training and again 6 months later. One-way repeated-measures analysis of variances and dependent sample t-tests demonstrated significant changes for all items, 11 of which were in the direction of more positive attitudes about BPD. For six items, attitudes did not change immediately after training, but 6 months later had changed significantly. Findings indicate that brief training can foster enduring improvements in clinician attitudes and beliefs about BPD.